In Vote, Peace Talks Dog Colombia's Leader

VIGÍA DEL FUERTE, Colombia—Colombia's economy is growing, the violence that once buffeted hamlets like this one has ebbed, and the government is closer than ever to signing a peace deal with Marxist rebels.

Yet Colombian President Juan Manuel Santos, scion of a wealthy political family who many here say lacks the common touch, faces what a few months ago would have been unthinkable: losing his office in two rounds of voting that...